Double-edge gun drill

Abstract

The utility model provides a double-edge gun drill, which relates to the technical field of deep hole drill tools, and comprises a tool bit and a tool bar, at least two groups of cutting edges are symmetrically arranged on the tool bit, chip grooves corresponding to the cutting edges in number are arranged on the tool bit, cooling holes are arranged on the cutting edges, chip auxiliary holes are arranged in the chip grooves, and the cooling holes are connected with the chip auxiliary holes. A chip separating groove is formed in the front cutter face of the cutting edge. The chip separating grooves are formed and distributed in a staggered mode, so that the cutting chips can be effectively separated, and the cutting chips are prevented from being too long; the chip separating grooves are formed in the front cutter surface, so that the chip separating grooves do not need to be repaired during later grinding, the grinding steps are reduced, and the cost is reduced; the chip removal auxiliary holes are formed in the chip removal grooves, accumulated iron chips are scattered through cooling liquid, the chip removal thrust of the iron chips is increased, the chip removal smoothness is improved, and the problems that due to chip blockage, a tool is abraded too fast and fractured are solved.

Description

Technical Field

[0001] This utility model relates to the field of deep hole drilling tools, and in particular to a double-edged gun drill. Background Technology

[0002] Existing deep hole drills, such as single-edged and double-edged gun drills, produce relatively long chips during drilling due to the testing of chip geometry. This leads to a rapid increase in chip removal resistance, which can easily cause chip clogging and, in severe cases, tool breakage, affecting drilling efficiency and quality. In addition, the chip grooves on conventional tools are located on the back angle face of the cutting edge, requiring re-grinding each time they are ref-ground, increasing the number of grinding steps and making it difficult to reduce costs. This application addresses the above-mentioned shortcomings. Utility Model Content

[0003] The purpose of this invention is to provide a double-edged gun drill that can shorten the length of chips during drilling, improve chip removal smoothness, and avoid problems such as breakage caused by chip blockage.

[0004] To address the aforementioned problems, this utility model provides a double-edged gun drill, comprising a cutter head and a shank. The cutter head has at least two sets of cutting edges symmetrically arranged at its center. The cutter head also has chip removal grooves corresponding to the number of cutting edges. Cooling holes are provided on the cutting edges, and chip removal auxiliary holes are provided in the chip removal grooves. The cooling holes are connected to the chip removal auxiliary holes, allowing coolant to be discharged through both. The coolant discharged through the chip removal auxiliary holes increases the chip removal thrust, improves chip removal smoothness, and assists in chip removal. A chip-breaking groove is provided on the rake face of the cutting edges. This chip-breaking groove breaks the chips, shortening the chip length during drilling. Furthermore, the chip-breaking groove is located on the rake face, ensuring that the drill bit retains its chip-breaking function even after re-sharpening.

[0005] According to one embodiment of the present invention, the chip-breaking grooves are distributed at different positions on the two cutting edges, forming a staggered distribution, thereby staggering during circumferential cutting to ensure that the entire cutting edge is completely removed.

[0006] According to one embodiment of the present invention, the length of the chip-breaking groove is the same as the length of the rake face of the cutting edge, that is, the chip-breaking groove is set on the rake face of the cutting edge, opening through the entire face.

[0007] According to one embodiment of the present invention, the distances between the two chip-breaking grooves and the center position of the cutter head are L and L1, respectively, where L≥(1+1 / 3)L1, and preferably L=(1+1 / 3)L1.

[0008] According to one embodiment of the present invention, the double-edged gun drill also includes a shank connected to the shank.

[0009] According to one embodiment of the present invention, the cutter head, the cutter shank, and the cutter handle are connected by welding.

[0010] According to one embodiment of the present invention, each of the chip removal grooves is provided with one or more chip removal auxiliary holes.

[0011] According to one embodiment of the present invention, the chip removal auxiliary hole is an elongated hole, such as an elliptical hole, which can play a better role in assisting chip removal.

[0012] The beneficial effects of this utility model are that by setting chip-breaking grooves and distributing them in a staggered manner, the chips can be effectively broken up, preventing excessively long chips; the chip-breaking grooves are set on the rake face, so there is no need to repair the chip-breaking grooves during later regrinding, reducing grinding steps and lowering costs; by setting chip removal auxiliary holes in the chip removal grooves, the coolant is used to disperse the accumulation of iron chips, increasing the chip removal thrust, improving chip removal smoothness, and avoiding problems such as excessive tool wear and breakage caused by chip blockage. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of a double-edged gun drill;

[0015] Figure 2 This is a schematic diagram of the structure at the cutter head;

[0016] Figure 3 This is a schematic diagram showing the distance between the two chip-breaking grooves and the center of the cutter head;

[0017] Figure 4 This is a schematic diagram showing the distribution of chip-breaking grooves on the tool head. Detailed Implementation

[0018] The following description is only intended to disclose the present invention so that those skilled in the art can implement it. The embodiments in the following description are merely examples, and those skilled in the art will conceive of other obvious modifications. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0019]

Example 1

[0020] A type of double-edged gun drill, such as Figure 1 It includes a cutter head 1, a cutter shank 2, and a cutter handle 3, which are welded together.

[0021] like Figure 2The cutting head 1 has at least two sets of cutting edges 11 symmetrically arranged at its center. The cutting head 1 has chip removal grooves 12 corresponding to the number of cutting edges 11, i.e., two chip removal grooves 12. Cooling holes 4 are provided on the cutting edges 11. Chip removal auxiliary holes 5 are provided in the chip removal grooves 12. The cooling holes 4 and chip removal auxiliary holes 5 are connected. Coolant can be discharged through the cooling holes 4 and chip removal auxiliary holes 5. The coolant discharged through the chip removal auxiliary holes 5 can increase the chip removal thrust. The focused cooling pressure can disperse the accumulation of iron chips, prevent iron chips from clogging, improve the smoothness of chip removal, and play an auxiliary role in chip removal. In this embodiment, the chip removal auxiliary holes 5 are long and thin holes, such as elliptical holes, which can play a better auxiliary role in chip removal. Preferably, the flow area of ​​the chip removal auxiliary holes 5 is smaller than the flow area of ​​the cooling holes 4.

[0022] In this embodiment, each chip removal groove 12 is provided with a chip removal auxiliary hole 5. In other embodiments, each chip removal groove 12 may be provided with a plurality of chip removal auxiliary holes 5.

[0023] like Figure 3 , Figure 4 Chip-breaking grooves 6 are provided on the rake face of the cutting edge 11, namely chip-breaking groove one 61 and chip-breaking groove two 62. The length of chip-breaking groove 6 is the same as the length of the rake face of the cutting edge 11. That is, the chip-breaking groove 6 is set on the rake face of the cutting edge 11, opening the entire face. The chip-breaking groove 6 plays a role in breaking the chips, shortening the chip length during drilling. Furthermore, the chip-breaking groove 6 is set on the rake face, which allows the drill bit to still have the chip-breaking function after regrinding. In this way, it is not necessary to repair the chip-breaking groove during later regrinding, reducing the grinding steps and reducing costs.

[0024] like Figure 4 The chip-breaking grooves 6 are distributed at different positions on the two cutting edges 11, forming a staggered distribution. This misalignment during circumferential cutting ensures that the entire cutting edge is completely removed, achieving a fully effective chip-breaking effect. Specifically, as shown... Figure 3 The distances between the two chip-breaking grooves 6 and the center position of the cutter head 1 are L and L1, respectively, where L≥(1+1 / 3)L1, and preferably L=(1+1 / 3)L1.

[0025] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. A double-edged gun drill, characterized in that: The tool includes a cutting head (1) and a cutting shank (2). The cutting head (1) has at least two sets of cutting edges (11) arranged symmetrically at the center. The cutting head (1) has chip removal grooves (12) corresponding to the number of cutting edges (11). The cutting edges (11) have cooling holes (4). The chip removal grooves (12) have chip removal auxiliary holes (5). The cooling holes (4) and chip removal auxiliary holes (5) are connected. Coolant can be discharged through the cooling holes (4) and chip removal auxiliary holes (5). The coolant discharged through the chip removal auxiliary holes (5) plays a role in assisting chip removal. The rake face of the cutting edge (11) has a chip separating groove (6). The chip separating groove (6) plays a role in separating iron chips.

2. The double-edged gun drill according to claim 1, characterized in that: The chip-breaking grooves (6) are distributed at different positions on the two cutting edges (11), forming a staggered distribution.

3. The double-edged gun drill according to claim 1 or 2, characterized in that: The length of the chip groove (6) is the same as the length of the rake face of the cutting edge (11).

4. The double-edged gun drill according to claim 2, characterized in that: The distances between the two chip-breaking grooves (6) and the center position of the cutter head (1) are L and L1, respectively, where L≥(1+1 / 3)L1.

5. The double-edged gun drill according to claim 1 or 2, characterized in that: The double-edged gun drill also includes a handle (3) connected to the shank (2).

6. The double-edged gun drill according to claim 5, characterized in that: The cutter head (1), cutter bar (2) and cutter handle (3) are connected by welding.

7. The double-edged gun drill according to claim 1, characterized in that: Each of the chip removal grooves (12) is provided with one or more chip removal auxiliary holes (5).

8. The double-edged gun drill according to claim 1, characterized in that: The chip removal auxiliary hole (5) is an elongated hole.

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